The four-in-hand knot (I mean, really, why do you want to make yourself look like a real estate agent/car salesman/high-end restaurant waiter/police detective/other person who is required to wear a tie as part of a uniform?)

Bow ties on those under retirement age. Sorry.
Hankies (sorry, pocket squares) with absolutely everything. Some do them well but in many instances they do bugger all for an outfit and even detract.
19 year olds trying to dress like Tory cabinet members from the 1960s ('Is it OK to wear a bespoke three piece to the college bar on a Tuesday night?').
The adjective 'sweet', unless it's used to describe confectionery; the verb 'to rock'. Anyone old enough to remember Tommy Vance would surely wince as much as I do every time it's used.
Tassels on shoes.

For me it depends a lot on the weight of the tie. FiH is practically necessary with knits if you don't want em huge. Exceptional thin ties demand something weightier though.

That is one consideration. However, another thing is that most of the time, you'll see the tiny knot on very tall and sequoia necked (usually very overweight) people. They need a ton of tie length to go around the neck and for the tie to reach the belt. Therefore, the knot ends up being tied on the very narrow part of the tie resulting on the micro 4IH.